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• avdevice/avdevice : fix return value of avdevice_list_devices()

  10 juillet 2022, par Marton Balint

  avdevice/avdevice : fix return value of avdevice_list_devices()
  According to API docs avdevice_list_devices(), avdevice_list_input_sources()
  
  and avdevice_list_input_sinks() should return the number of autodetected
  
  devices on success. This is redundant with AVDeviceInfoList->nb_devices so it
  
  was not noticed earlier that none of the underlying device list functions work
  
  like that.
  Let's fix it in generic code to make it in line with the API docs.
  Fixes ticket #9820.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavdevice/avdevice.c

• Dynamically check (and change ?) audio file codec [closed]

  25 juillet 2024, par user2m

  Hey all I have a web app where users can upload audio files like mp3's, wavs and m4a's.
I'm simply using the default html audio player to render the audio.
A while back I started noticing that a sporadic few of the audio players were greyed out.

  


  I went into my supabase backend to open the actual audio file and found that I was able to play the audio file
when I downloaded it to my PC.

  


  Upon reading this thread (Why is this specific m4a audio file not playing on the )
it looks like the issue is the codec with some .m4a files.
Some m4a files are using the AAC (widely supported) codec and some are not.

  


  Currently I have JS code that

  


  

  1. grabs the file blob

  


  2. checks if the upload name contains mp3, wav or m4a

  


  3. uploads the blob to supabase

  


  


  in between 2 and 3 I'd like to check that the codec of the blob is AAC and if possible change the codec (??)
I've asked CGPT for a solution but it point sme to FFMPEG and from reading the docs it looks like FFMPEG core is about 30MB to load...
(https://ffmpegwasm.netlify.app/docs/getting-started/usage/)
This seems like a lot to me - granted most of the app will have already been loaded by the time a user gets to this flow.
I just wanted to reach out and see if anyone has figured out a better solution

  


• How to encrypt webm file using Clear Key to play with Google's Shaka Player ?

  23 janvier 2017, par Nam Pham

  I’m developing a small system which will be used to streaming protected content over the web with MSE/EME API.

  This is some tools I’m using :

  • FFMPEG
  • Google’s Shaka-Packager
  • webm_crypt

  I can create .webm file and package them using shaka-packager into mpd file in order to feed to shaka-player. But following by the Clear Key section in the Shaka docs I have to encrypt webm file require pair of KeyId and Key.
  By using webm_crypt, I can created encrypted content by follow this document on 2.2.7 but I have no idea how to get the key pairs for the shaka-player DRM system.